[Rachana] Fix 'ൄ' naming 'r2'

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>
[Meera] Add missing 'psts' rule for r2 'ൄ'

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>